for循环输出数字金字塔--java

 1 public class deng {
 2 public static void main(String args[])
 3 {
 4     int n,i,k,j;                    
 5     for(n=1; n<=4; n++) //n在最外层控制行数 
 6     {
 7         for(i=1; i<=4-n;i++)
 8             System.out.print(" ");
 9         for(k=1; k<=n; k++)
10             System.out.print(k);
11         for(j=n-1; j>=1;j--)
12             System.out.print(j);
13         
14         System.out.print("\n");
15         
16     }
17 }
18 }